weizhouapache commented on code in PR #9955:
URL: https://github.com/apache/cloudstack/pull/9955#discussion_r1977239445
##########
engine/schema/src/main/java/com/cloud/upgrade/DatabaseUpgradeChecker.java:
##########
@@ -486,6 +488,39 @@ public void check() {
}
}
+ private void initDistributedLock() {
+ LOGGER.info("Setting up distributed lock table if not created.");
+ TransactionLegacy txn = TransactionLegacy.open("initDistributedLock");
+ txn.start();
+ String errorMessage = "Unable to get the database connections";
+ try {
+ Connection conn = txn.getConnection();
+ errorMessage = "Unable to create distributed_lock table in the
'cloud' database ";
+ String sql = "CREATE TABLE IF NOT EXISTS
`cloud`.`distributed_lock` (" +
+ " `name` varchar(1024) NOT NULL," +
+ " `thread` varchar(1024) NOT NULL," +
+ " `ms_id` bigint NOT NULL, `pid` int NOT NULL," +
+ " `created` datetime DEFAULT NULL," +
+ " PRIMARY KEY (`name`)," +
+ " UNIQUE KEY `name` (`name`)" +
+ ") ENGINE=InnoDB DEFAULT CHARSET=utf8";
+ try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
+ pstmt.execute();
+ }
+ try (PreparedStatement pstmt = conn.prepareStatement("DELETE FROM
cloud.distributed_lock WHERE ms_id=?")) {
Review Comment:
maybe add a debug message for it?
```suggestion
LOGGER.info("Deleting existing distributed locks with ms_id = "
+ ManagementServerNode.getManagementServerId());
try (PreparedStatement pstmt = conn.prepareStatement("DELETE
FROM cloud.distributed_lock WHERE ms_id=?")) {
```
##########
engine/schema/src/main/java/com/cloud/upgrade/DatabaseUpgradeChecker.java:
##########
@@ -486,6 +488,39 @@ public void check() {
}
}
+ private void initDistributedLock() {
+ LOGGER.info("Setting up distributed lock table if not created.");
+ TransactionLegacy txn = TransactionLegacy.open("initDistributedLock");
+ txn.start();
+ String errorMessage = "Unable to get the database connections";
+ try {
+ Connection conn = txn.getConnection();
+ errorMessage = "Unable to create distributed_lock table in the
'cloud' database ";
+ String sql = "CREATE TABLE IF NOT EXISTS
`cloud`.`distributed_lock` (" +
+ " `name` varchar(1024) NOT NULL," +
+ " `thread` varchar(1024) NOT NULL," +
+ " `ms_id` bigint NOT NULL, `pid` int NOT NULL," +
Review Comment:
```suggestion
" `ms_id` bigint NOT NULL," +
" `pid` int NOT NULL," +
```
##########
framework/db/src/main/java/com/cloud/utils/db/DbUtil.java:
##########
@@ -199,28 +200,36 @@ public static final String getTableName(Class<?> clazz) {
public static boolean getGlobalLock(String name, int timeoutSeconds) {
Connection conn = getConnectionForGlobalLocks(name, true);
if (conn == null) {
- LOGGER.error("Unable to acquire DB connection for global lock
system");
+ LOGGER.error("Unable to acquire DB connection for distributed
lock: " + name);
return false;
}
- try (PreparedStatement pstmt = conn.prepareStatement("SELECT
COALESCE(GET_LOCK(?, ?),0)");) {
- pstmt.setString(1, name);
- pstmt.setInt(2, timeoutSeconds);
-
- try (ResultSet rs = pstmt.executeQuery();) {
- if (rs != null && rs.first()) {
- if (rs.getInt(1) > 0) {
- return true;
- } else {
- if (LOGGER.isDebugEnabled())
- LOGGER.debug("GET_LOCK() timed out on lock : " +
name);
- }
+ int remainingTime = timeoutSeconds;
+ while (remainingTime > 0) {
+ try (PreparedStatement pstmt = conn.prepareStatement(
+ "INSERT INTO cloud.distributed_lock (name, thread, ms_id,
pid, created) " +
Review Comment:
I was wondering whether "INSERT INGORE INTO" is better than "ON DUPLICATE
KEY UPDATE", and finally get an impression that "ON DUPLICATE KEY UPDATE" looks
better
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